QCAD is an application for computer aided drafting (CAD) in two dimensions (2D). With QCAD, you can create technical drawings such as plans for buildings, interiors, mechanical parts, or schematics and diagrams. QCAD can be easily extended through plugins and its very powerful and complete ECMAScript (JavaScript) interface.

OpenCSG is a library that does image-based CSG rendering using OpenGL. CSG is short for "constructive solid geometry" and represents a modeling technique for composing shapes with 3D-primitives which are combined using volumetric boolean operations. Image-based CSG rendering means rendering CSG shapes without calculating their surface in object-space. Instead, the image of a CSG shape is composed directly in the frame-buffer of the graphics hardware by rather sophisticated stenciling and z-buffer operations.

CADauno is a 3D modeling tool based on the NURBS surfaces. It aims to exploit the power of NURBS at representing free forms. It provides an interpolation facility ("skinning" technique), which enables the designer to create a closed surface passing through different section curves. This makes it possible, as an example, to build a human body 3D model starting from sections provided by a Computed Axial Tomography scanner.

Solid|matter is a 3D CAD application for product design. It is planned to feature parametrical, solid-based modeling, a sketcher with associative dimensions, and basic simulation of assembly kinematics. It is also designed to integrate well with the Gnome desktop.

DXF Export Java is a Java library for exporting CAD entities, along with their properties, to stream or AutoCAD DXF files at high speed and with ease. Creating a new DXF file takes only one call of the exporter class, provided that user data has been prepared and loaded to the required fields beforehand. The library handles all major entities, including Arc, Bezier, Circle, Ellipse, Hatch Pattern, Line, Multi-line Text, Pixel, Polyline, Rectangle, and Text. It also supports layers, colors, line styles, and other important properties. Source code and working demos are included.

Gmsh is an automatic 3D finite element grid
generator with built-in CAD and post-processing
facilities. Its design goal is to provide a simple
meshing tool with parametric input and advanced visualization capabilities. It is built around four modules: geometry, mesh, solver, and post-processing. The specification of any input to these modules is done either
interactively using the graphical user interface
(based on FLTK and OpenGL) or in ASCII text files
using Gmsh's own scripting language.

QSapecNG (Symbolic Analysis Program for Electric Circuits (New Generation)) is a Qt-based program for symbolic analysis of linear analog circuits. It consists of two independent parts, the SapecNG framework engine and the QSapecNG GUI. It was based on SapWin. Users can draw, solve, analyse, and manage analog circuits.

gCAD3D is a 3D CAD-CAM application which features an integrated 3D OpenGL viewer, a program interpreter for geometry and NC-commands in 3D, and a programming interface for user programs. It has support for importing Step files and support for both importing and exporting Iges, DXF, and VRML files.